Incandescent lamp



Sept. 1s, 1923.

D. GORDON INCANDESCENT LAMY Filed OCL.

Patented Sept. 118, 1923. I

namnneoenon, or New Yoan, N. IY.

nicannnsonnr LAMP.

application filed October 23, 11.919.A Serial No. 332,595.

To all whom. it may a-cern.'

Bc it known that I, DANIEL GORDON, a citizen ot the United States, residing at New York, in the county of INew York and State of New York, have invented certain new and useful improvements in incandescentl Lamps; and .TL do declare the following to be a Jlull, clear, and exact description of the. invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in incandescent lamps.

The primary object is to provide a simple and practical lamp provided with two filaments so constructed that should one of said filaments burn out the second filament will be automaticallylighted without the least delay. j

With the above and other objects in view, the invention consists ot' certain novel features of construction and the combination' and arrangement of parts as will be more fully describedand claimed.

l attain these objects by constructing the lamp. as illustrated in the accompanyingdrawings, in which-- Fig. l is a vertical sectional view show ing the rst circuit broken and the second or emergency circuitin use, and

Fig. 2, is a similar `view, but showing the first circuit in use.

Similar numerals oit' reference designate similar parts throughout the views.

lleterence is new had to the drawing in which is shown a bulb l of the usual construction. Mounted upon one end of" the bulb is the usual socket engaging plug 2 that embodies a shell 3 having one end surrounding the neck of the bulb and fastened thereto, and the other end equipped. with a block 4- ot' insulatingl material carrying a contact 5, the latter and the shell 3 being adapted to engage the respective central contact and shell of the socket or receptacle that is connected in the electric circuit. Extending into the butt end of the bulb 1 is a short glass tube 6 formed with a closed inner end and with an open rear'end to receive a block to be described. As is readily seen, the tube is formed integral withthe l bulb, Extending from the inner end of the short tube G is an elongated glass stem 7 provided at its outer end with inner and outer sets of radiating arms 8 and 9 respectively, adapted to support two separate lament circuits 10 and 11.

VMounted in said tube 6 is a blockr V12u of i suitable insulating material adapted to support an electromagnet 13 which is in circuit with the filament 11` as shown. lThe block is provided in its inner face with a socket 14,

to one wall of which one end of the filament isattached. Extending inwardly from the bottom of the socket is a suitable spring arm or switch arm v15, which, when the bulb is hted, is attracted by the magnet to open the filament circuit 1.0. The end of the circuit 10 is provided with acontactipoint 16 shown in the drawing as being a small anguiar piece of metal.. A short wire 17 connects the inner end of the switch arm 15 to the shell of the socket engaging 'plug 2 so as to complete the circuit l() when the lilament 1l is broken. The other ends of the filament circuits are suitably connected to the'contact' as shown.

In operation, the bulb4 is placed in 'Socket and for an instant both iilaments are lighted, but the action of the energized electv tromagnet 13 attracts the switch arm "15 an opens the filament circuit 'l0 and leaving the filament 11 burning. Shouldthe lame'ni circuit become brokemthe switch arm is re-iy leased and closes the filament circuit Ll()a It is readily seen that this construction doubles the lite et an incandescent lamp and 'is operable automatically when one filament is broken.

From the foregoing description taken in connection with the accompanying draw= ings, the construction and operation of the invention will be understood without' requ iring a more cxtendedexplanation.

'arious changes in the, form, proportion and minor details of construction may be re.

sorted to, without departinga fromv the prin` the claimed invention.

- I claim:

In an incandescent lamp, avbulb having ciple or sacrilicing: any of the advantages of a pocketextending inwardly from its buttn by the bulb block in the pocket, a. ilarnent Wire leading' from the terminal contact through the pocket and bulb and connected with the shell plug and having the switch 5 included in its circuit, an electromagnet carried 'by the bulb block adjacent the switch, and a second filament wire leading from the terminal Contact and connected with thevsheli plug and having the electro magnet in its circuit and energizing the e1ec- 10 tro-magnet to open the switch.

In testimony whereof I have hereunto se! my hand.

DANIEL GORDN. 

